2- it is also used for cursing like "vete a la verga" would be something like "go fuck yoursef".
3- it also can be used to descrive something very chingon. Most of the times when you want to descrive something real bad-ass using this word you add an s at the end of the word making it sound plural.
it is used for cursing like "pinchi rasista" would be something like "fucking racist"
it comes from the word pinche, an adjective. Thats how someone that has the lower position within a company is called. the word pinche can be used for cursing also.
1- Robin: DUde what happened with the girl that you used to go out with?!
Kevin: dont you ever dare to remind me that pinchi slut again!!
2- What the verga do you dink youre doing with that pinche cucumber?!?!!!!!?